>  I recently found that they are badly affected by the
>  proximity of an operating GSM cellphone. Their display goes
>  quietly mad running up and down and or sitting at random
>  values. Remove phone from area and all is well again. Range
>  of effect is up to about ?500 mm?.

Perhaps it's because it's consumer electronics?

When we release a new device, we test it to the spec that our
customer demands.  It HAS to pass.  Consumers don't demand
the same.

OTOH, we don't test to the level of emissions from a cellphone
at 500mm.

Mike H.
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